diff --git a/django/db/models/base.py b/django/db/models/base.py
index 6d823b62cb..9307a80647 100644
--- a/django/db/models/base.py
+++ b/django/db/models/base.py
@@ -17,10 +17,6 @@ import types
 import sys
 import os
 
-# For Python 2.3
-if not hasattr(__builtins__, 'set'):
-    from sets import Set as set
-
 class ModelBase(type):
     "Metaclass for all models"
     def __new__(cls, name, bases, attrs):
diff --git a/django/db/models/query.py b/django/db/models/query.py
index c8d75bba72..408fe1ff47 100644
--- a/django/db/models/query.py
+++ b/django/db/models/query.py
@@ -6,6 +6,10 @@ from django.utils.datastructures import SortedDict
 
 import operator
 
+# For Python 2.3
+if not hasattr(__builtins__, 'set'):
+    from sets import Set as set
+
 LOOKUP_SEPARATOR = '__'
 
 # Size of each "chunk" for get_iterator calls.